At what altitude does hypoxia occur?

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Tags

1. #hypoxia
2. #entirely
3. #change
4. #altitude
5. #barometric
6. #encountered
7. #atmosphere
8. #constant
9. #rather
10. #oxygen
11. #about
12. #higher
13. #pressures
14. #reduced
15. #concentration
16. #stays
17. #increases
18. #exposure
19. #altitudes